Structure 1.5 Ideal gases

Structure 1.5.1 and 1.5.2

Understandings:

Understandings:

**An ideal gas consists of moving particles with negligible volume and no intermolecular forces. All collisions between particles are considered elastic.**-
**Real gases deviate from the ideal gas model, particularly at low temperature and high pressure.**

- Recognize the key assumptions in the ideal gas model.
- Explain the limitations of the ideal gas model.

Structure 1.5.3

Understandings:

Understandings:

**The molar volume of an ideal gas is a constant at a specific temperature and pressure.**

- Investigate the relationship between temperature, pressure and volume for a fixed mass of an ideal gas and analyse graphs relating these variables.

- The names of specific gas laws will not be assessed.
- The value for the molar volume of an ideal gas under standard temperature and pressure (STP) is given in the data booklet.

- Reactivity 2.2 Graphs can be presented as sketches or as accurately plotted data points. What are the advantages and limitations of each representation?

Structure 1.5.4

Understandings:

Understandings:

**The relationship between the pressure, volume, temperature and amount of an****ideal gas is shown in the ideal gas equation***PV*=*nRT*and the combined gas law.

- Solve problems relating to the ideal gas equation.

- Units of volume and pressure should be SI only. The value of the gas constant
*R*, the ideal gas equation, and the combined gas law, are given in the data booklet.